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1.4 Computer Science (Types of Networks (Advantages (Can communicate with…
1.4 Computer Science
Types of Networks
LAN
Local Area Network - Collection of computers over a small geographical area that are connected and managed centrally
WAN
Wide Area Network - Collection of computers over a widegeographical area that are connected and managed centrally
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Disadvantages
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If one part of the network fails, the whole network could go down
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Security
Encryption
Encrypting data scrambles the data with a maths formula or "key" which turns the data into seemingly unrelated characters. Encrypted data is called Cipher text and un-encrypted is called plain text
The different types are WAP, WAP2 and WEP however this should not be used as it is weak
Access Levels
User access levels control parts of network different groups can access. High authority have higher access levels allowing them to see more sensitive data. They also have the ability to change people's access levels.
Passwords
Password are the most common way to prove your identity. They should be strong with a range of characters and should be changed regularly
Forms of Network
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Peer-to-Peer Network
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Each computer on the network needs to be ,maintained separately
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Wireless
A Modem works by taking the digital signals from a computer and turn them into analogue signals. These are passed down a phone line where another modem picks them up and turns them back into digital.
A Broadband router combines a switch and a modem. The router allows many computers to connect to the broadband network. It also has a admin area
DNS
A DNS is a server that when a domain name is searched in the URl it looks up that domain name on its database and finds the matching IP Address and forwards the request on using that IP address
File Compression
That means that the raw sound or movie file has a maths formula applied to it (called a 'codec', short for coder / decoder) so that the raw file gets squashed or 'compressed'. The file then becomes much smaller in size so it can be downloaded and streamed more quickly.
A Network policy is a set of rules or expectations that explain how a person should act and behave on a device. It may also describe responses to certain situations
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